Japanese knotweed
A knotweed management plan is in the pack and the end date has passed. What has the survey not done to renew or inspect that plan?
The survey has not renewed the knotweed management plan and has not inspected the ground as a fresh management inspection. The plan is in the pack and the end date has passed, so you have an expired document, not a current programme. The home survey can note that the paperwork is out of date and can record any growth it actually saw. It does not extend a contractor's plan by mentioning it, and it does not replace the visits that plan may have required. What has not been done is renewal and a plan-led inspection.
Last reviewed 24 October 2026. Written for buyers in England and Wales unless this answer says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.
What is the fuller explanation?
Japanese knotweed paperwork is only as useful as its dates, its map and the treatments it records. An end date that has passed means those commitments, whatever they were, are no longer current on the face of the document. RICS has published a professional standard on knotweed and residential property. That standard does not turn a home survey into a new management plan. If the surveyor saw stems, they should say where. If they saw none, that is only the day of the visit.
Ask the solicitor for the full plan, the treatment records and any proposal to extend it, and ask the company named on the plan what renewal would involve. Do not assume the survey has quietly re-inspected to the plan's method. If growth is visible, say so when you instruct anyone. If it is not, still treat the expiry as a live paperwork issue. The home survey's limit is the expired date and the plants it could see. It has not restarted the plan.
What should you ask your surveyor?
- Did you record the plan's end date as already passed?
- What growth, if any, did you see, as distinct from what the plan claims?
- Have you avoided describing this visit as a renewal inspection?
What are the typical next steps?
- Treat the management plan as expired on its own end date.
- Ask the solicitor for records and any renewal proposal.
- Do not read the home survey as a new knotweed inspection under that plan.
Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.
Also asked about this
If no stems were visible, has the plan effectively renewed itself?
No. A clear-looking border on one day does not renew a plan whose end date has passed. The survey has not extended the paperwork and has not carried out the plan's own inspection regime or renewed it. Expiry still stands.
Does a guarantee inside the plan still speak after the end date?
Read the guarantee's own wording with the solicitor. The survey has not decided that a guarantee survives the end date, and it has not inspected the site in order to revive the plan or extend the end date. The end date still governs.